SaaS Revenue Calculator
SaaS revenue trajectory.
Project SaaS revenue with this SaaS revenue calculator. Forecast cumulative revenue, ending MRR, and annualized run rate over any growth period.
What this tool does
This calculator models how subscription revenue evolves over a defined period. It takes your current monthly recurring revenue, applies a consistent monthly growth rate, and projects three key outputs: total cumulative revenue across all months, your ending monthly recurring revenue at the projection's close, and the annualized revenue rate at that endpoint. The primary drivers are your starting MRR and the monthly growth percentage—even small changes to either significantly shift the final figures. A typical scenario involves a SaaS business forecasting revenue 12 or 24 months ahead to model scaling. The calculation assumes steady month-over-month growth without variation, does not account for churn, pricing changes, or seasonal fluctuations, and should be treated as an illustrative model rather than a prediction of actual performance.
Quick answer: with the default values, the result is $948,856.32 (Revenue Over 12 Months). Adjust the values below for your own figures.
Enter Values
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Formula Used
Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
SaaS revenue compounds when monthly growth stacks. Current MRR grows at a monthly rate over a projection period. The calculator shows cumulative revenue captured over the projection (sum of all monthly MRR values) and the ending MRR at period end - the two numbers most investors ask.
50k current MRR at 8% monthly growth over 12 months compounds to about 117k MRR by the final month, a 1.40M annual run rate. Total cumulative revenue over the 12 months is about 949k - much more than the 600k naive estimate from starting MRR × 12. Compound growth is the reason SaaS valuations stretch into high multiples.
The calculator assumes steady growth. Real SaaS businesses see growth rates shift quarter-to-quarter based on hires, product launches, market conditions. Use for directional forecasting; do not use for commitments to investors or board. For committed forecasts, layer assumed growth rates by quarter rather than constant monthly.
Run it with sensible defaults
Using current mrr of 50,000, monthly growth of 8%, projection months of 12 months, the calculation works out to 948,856.32. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Current MRR, Monthly Growth %, and Projection Months — do not pull with equal force.
How the math works
Cumulative revenue = MRR × ((1 + growth)^months - 1) ÷ growth. Ending MRR = MRR × (1 + growth)^months.
£50,000 MRR growing at 8% over 12 months = $948,856.32.
Inputs
| Starting MRR | $50,000.00 |
|---|---|
| Ending MRR | $116,581.95 |
| Ending ARR | $1,398,983.40 |
| Monthly Growth | 8.00% |
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes cumulative revenue over your projection period using the geometric series formula for recurring revenue. It takes your current monthly recurring revenue (MRR) and applies a constant monthly growth rate across the number of months specified. The formula sums all monthly revenues as they grow: each month's MRR is multiplied by the compounding growth factor, then all months are added together. The calculator also derives your projected ending MRR by applying the growth rate to your starting figure for the full period. The model assumes growth remains constant month-to-month, that revenue compounds smoothly without fluctuation, and that no customers churn. It does not account for seasonal variations, price changes, customer acquisition costs, operating expenses, or actual market conditions.
References
Frequently Asked Questions
Why so much more than MRR × 12?
Is 8% monthly growth realistic?
ARR or MRR for investor discussions?
Why not use annual growth?
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